Hi, I am doing some undergraduate work in Sweden, and for one of my tests, I need to place a material at -40 to about -50 degrees Celsius for a short period of time for thermal cycling. Unfortunately, my access to equipment is rather limited here The current method we're using is just wrapping it in a cloth and dripping liquid nitrogen onto it until the thermocouple inside the cloth says -40 C. Rather unscientific, if I do say so myself. So we're trying to come up with a quick and simple solution, as buying the proper lab freezer around here would take much longer than I have time to wait for. A few others and I have thought up a way to use our liquid nitrogen in another way, basically creating an insulated container for the liquid nitrogen and placing the samples in another compartment near the nitrogen at a place our thermocouple says is -40 to -50 Celsius. Is there a better way to attain -40 to -50 degrees Celsius? Thanks!